I'll get one in before all the "USE THE SEARCH FUNCTION!!!!!!" police chime in.
I believe most guys have found that 5.5-6 turns is about max they want to go because the truck sits level. Don't know if that's as many as they will physically go or not, but why would you go any higher? I went 3.5 on mine and it raised it about 1.5-1.75 inches. It still has a bit of a rake to it, which I like. I actually think they look sort of funny sitting level.